No president who performs his duties faithfully and conscientiously can have any leisure.

You don't have to be pretty like her. You can be pretty like you.

"Every like, comment, and share from my fans means the world to me—it's like getting a little hug through the screen."

Education is one of the most powerful tools we have for reducing inequality and promoting social mobility.

The future of business is digital, and the future of digital is in the cloud.

数学的快乐来自于为理解而奋斗。